Ranger HA - Documentation

[#1]

I'm reading ranger user guide and it's not clear for me what I need to do to setup ranger with HA:

http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.3.2/bk_Ranger_User_Guide/content/ch09.html

Do I need to change any settings on Ranger or on HDFS?

Thanks.

[#2 · Accepted solution]

You would be changing ranger repo to point to active name node after restarts or failover of name nodes

No changes in ambari

Only ranger repo

Please see this screenshot

[#3]

Does that mean Ranger itself cannot be HA but it can work with HA enabled services? And if we the repo has to be changed manually, what is it that Ranger is doing for hA?

[#4]

@bsaini@hortonworks.com

You can enable Ranger HA but for NN , you have to configure it manually

[#5]

For NN with HA, what should you put for NameNode URL value?

[#6]

Hi Guilherme,

Ranger itself supports HA, meaning you can install multiple instances of the Ranger Admin UI. However as far as I know, Ranger does not support HDFS HA at the moment, so you need to set the active namenode in the repository setting of the HDFS service. This setting is only used for lookups when you create new Policies, so if you can live without this feature, its not a big deal.

Jonas

[#7]

Ranger does support NN HA from HDP 2.3.

No need to update the active name nodes in Ranger repo config in case of failover.

[#8]

To vperiasamy, but on namenode url, you still need to specify the active namenode url like hdfs://myactive.nn.com:8020 , instead of the HA sevice name like: hdfs://myhdpcluster

[#9]

@Neeraj Sabharwal @Jonas Straub @vperiasamy

Ranger UI configuration input box for FSDefaultfs defaults to the “clustername”, but documentation specifies to enter the “NameNode”. (Current assumption is that “NameNode” is likely the correct parameter – working when configured according to Hortonworks HDP2.3.2 doc Chap 9: “Special Requirements for High Availability Environments”).

Question : if there is a solution or fix that would allow Ranger HDFS Repository configuration to use fs.defaultFS instead of the active NameNode.

[#10]

i use ranger 6.0 with ambari 2.4 HDP 2.5

ambari only copy core-site.xml to /etc/ranger-admin/2.5.0.0-1245/0,but acutally after HA namenode,we need hdfs-site.xml

so ,i do as below

ln -s /etc/hadoop/2.5.0.0-1245/0/hdfs-site.xml to /etc/ranger-admin/2.5.0.0-1245/0